UNIVERSITY EXAMINATIONS: 2019/2020
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN
SOFTWARE DEVELOPMENT/ INFORMATION SECURITY & FORENSCIS
BISF 1101/BSD 1102: COMPUTER ORGANISATION AND ARCHITECTURE
FULL TIME/ PART TIME
DATE: MAY, 2020 TIME: 6 HOURS
INSTRUCTIONS: Answer ALL Questions
SECTION B: 20 MARKS
a) Sequential Logic circuits are essential for the operation of the computer. Describe the operation of a
D-flip flop from first principles. Hence or otherwise Design a four bit RAM circuit based on the D flip flop. You are required to use the everycircuit app to simulate the circuit. Include truth tables and
operation
(20 Marks)
SECTION C: 20 MARKS
a) Combinational circuits are found in the ALU and other components. Design a seven segment LED
display for a security system. All 10 digits and letters A-F should be displayed without ambiguity.
Give the truth table, minimisation and implementation
(20 Marks)
